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JerryH
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40-70 SS Smokeless Load
Feb 16th, 2020 at 6:35pm
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I'm looking for help finding a smokeless 40-70 SS load for an original sporting Remington RB rifle. Bullet weight will be 365gr and 378gr. I'm not looking for a heavy or hunting load, just something to shoot for fun.

I shot BPRC Silhouette for quite a few years so am familiar with black powder. That's not what I'm looking for.

I may try to find a lighter bullet mould also.

Thanks,
JerryH
  
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25cal
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Re: 40-70 SS Smokeless Load
Reply #1 - Feb 16th, 2020 at 7:16pm
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Jerry- I have no personal experience loading for this round, but have a copy of Cast Bullet special edition from 1992 that has an article by John Campbell that covers this cartridge with cast bullets. If you Pm me your contact info, I'll get you the information. Steve
  
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JerryH
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Re: 40-70 SS Smokeless Load
Reply #2 - Feb 16th, 2020 at 7:33pm
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Steve,

Thank you very much. Will send a PM.

JerryH
  
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Bulseyetom
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Re: 40-70 SS Smokeless Load
Reply #3 - Feb 16th, 2020 at 8:59pm
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Jerry, I have had good luck with 27 grains of Buffalo Rifle with a 400 grain bullet.  Tom
  
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JerryH
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Re: 40-70 SS Smokeless Load
Reply #4 - Feb 16th, 2020 at 10:45pm
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Thanks Tom. I'll see if I can find any locally.

JerryH
  
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Spud
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Re: 40-70 SS Smokeless Load
Reply #5 - Feb 17th, 2020 at 4:23am
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Jerry,
I shoot a Rem Hepburn in .40/70 SS using a load of 22 gr of AR 2207 (Australian equivalent of IMR4198) behind a Lyman 406150 (approx. 330 gr with 20-1 alloy). Velocity is pretty consistent at around 1,350 fps. I'm using reformed Bertram .405 WCF cases.
Good luck, it's a great cartridge.
Spud
  
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Re: 40-70 SS Smokeless Load
Reply #6 - Feb 17th, 2020 at 7:08am
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I have no experience with the 40-70 but the new Lyman manual has loads listed for it.
  
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JerryH
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Re: 40-70 SS Smokeless Load
Reply #7 - Feb 17th, 2020 at 11:03am
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Thank you Spud and Gard72977.

JerryH
  
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wcf3840
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Re: 40-70 SS Smokeless Load
Reply #8 - Feb 17th, 2020 at 12:10pm
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Jerry,
I have a sporting roller in 40-70 BN. I'm shooting 18.6 grs of 4759 with a 285 gr bullet. Shoots well at 100 yds. 

Matt
  
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JerryH
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Re: 40-70 SS Smokeless Load
Reply #9 - Feb 17th, 2020 at 12:17pm
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Thanks Matt. I may try to find a lighter bullet to try also.

JerryH
  
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Re: 40-70 SS Smokeless Load
Reply #10 - Feb 17th, 2020 at 1:03pm
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Jerry,
I always shot 20 grains of IMR4227 with 300-330 grain bullets and 22.5 grains of IMR4227 with bullets 350 grains and over. It shot good. Rem Large Rifle primer, no wad Breech seated. I might lower the loads a little for fixed ammo. This in an original .40-70SS Hepburn.
  
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Re: 40-70 SS Smokeless Load
Reply #11 - Feb 17th, 2020 at 1:07pm
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Jerry,
You might also run into the problem I had. Being a Paper patch bullet caliber the groove diameter bullets might be too big to fit in the case making getting a fixed load shooting smokeless powder a little trickier.
  
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JerryH
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Re: 40-70 SS Smokeless Load
Reply #12 - Feb 17th, 2020 at 2:01pm
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Thanks Quarter-Bore,

This barrel has been bored to .409 from the original caliber and has been chambered fairly recently so I'm hoping there won't be any problems with fixed ammo. From the chamber cast I did it doesn't look like there will be.

JerryH
  
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Bulseyetom
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Re: 40-70 SS Smokeless Load
Reply #13 - Feb 17th, 2020 at 6:31pm
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What brass are you using?  405 Winchester brass works in mine but I am having a devil of a time finding more Hornady brass.  I hope it is like the shortage of 30-40 Krag a few years ago and it makes a comeback like that brass did.  Tom
  
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JerryH
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Re: 40-70 SS Smokeless Load
Reply #14 - Feb 17th, 2020 at 9:21pm
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Tom,

My chamber is cut for the Krag case. I have some stretched cases ordered from Buffalo Arms and it looks like they should be here tomorrow. Things are coming together slowly.

JerryH
  
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